I begin this lesson by watching the video, “Leap Frog: Adventures in Shapeville Park”. I like this video because it not only shows the Leap Frog animals building a park, but it also shows how shapes are seen and used in the real world.
For this standard 1.G.A.1, some students may not know the names of 3D shapes or they may confuse them with the names of 2D (flat) shapes (square, rectangle, circle, etc.). To help those students overcome this misconception, I like to use direct instruction to compare a square to a cube, circle to a sphere, etc. showing students that 2D shapes are flat, and 3D shapes are three dimensional. I then relate the 3D shapes to real world objects. By relating to real world objects, students can more easily conceptualize the difference between 2D (flat) and 3D shapes. It is important for first graders to discern the difference between 2D and 3D shapes and be able to relate them to real world objects (MP7).
After the video, I start by discussing the types of toys found at the toy store. We then make a class list and describe the shapes of the toys. I then present riddles, like the following:
I then display a sphere and a cube. And discuss its attributes, and explain that these are called 3Dimensional shapes. I then distribute sets of spheres and cubes to pairs or small groups. I like to give children time to explore the shapes.
I then display the first slide of the Three dimensional shapes.ppt, and ask questions to guide children to sort the shapes based on their attributes.
I ask volunteers to share the two groups they made, and I point out that there is more than one way to sort the shapes.
Then, viewing the second slide, I hold up each shape shown on the slide and say its name as children point to its picture. I have students discuss with a partner whether each shape has flat surfaces or curved surfaces, or both.
Then I hand out the Three dimensional shapes_worksheets.docx and have children sort three-dimensional shapes shown in the model into three groups based on curved and flat surfaces. Once students have successfully sorted their shapes, I turn them loose to continue the remainder of the worksheet independently.
To close out the lesson, I have students work with a shoulder partner and name an everyday object for each 3D object in this lesson (cube, sphere, rectangular prism, cone and cylinder).